The Born-Haber cycle is a series of steps that represent the formation of an ion

Question

The Born-Haber cycle is a series of steps that represent the formation of an ionic compound from a metal and a nonmetal.  For example, the steps in a Born-Haber cycle for the formation of NaCl(s) consist of sublimation of the metal Na atom (?Hsubl-Na) to form a gaseous Na atom, bond dissociation of the chlorine molecule (BECl2)  to form a gaseous Cl atom, ionization energy of the sodium atom (IENa) to form a gaseous Na+ ion, electron affinity of the chlorine atom (EACl) to form a gaseous Cl- ion, and the lattice energy of NaCl (LENaCl) involving the coalescing of the gaseous Na+ and Cl- ions to form a solid NaCl formula unit.

With the above summary in mind, which particular steps of the Born-Haber cycle would be represented in the following reaction?   

K(g) + F(g) ? K+(g) + F-(g)

BEF2 and EAK

BEK and BEF

BEF2 and EAK

BEK and BEF

Explanation / Answer

C. ?Hsubl-K, IEK and EAF

As K is in gaseous state, it gets ionized to give K+

Similarly gaseous F atom gets ionized to give F-.

As both are formed in gaseous state, no lattice energy involved.

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